{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["concept or principle", "machine or equipment", "material", "manufacturing standard", "manufacturing process", "application"], "input": "Both Hewlett Packard and Xerox ‘ are investing in 3D printing research and technology development ."}
{"concept or principle": ["technology"], "machine or equipment": [], "material": [], "manufacturing standard": [], "manufacturing process": ["3D printing"], "application": ["Hewlett Packard", "Xerox"]}